Knife sharpener



FIG. 1 is a top plan view of a knife sharpener showing our new design;

FIG. 2 is a side elevational view, wherein the opposite side is a mirror image thereof;

FIG. 3 is a side elevational view of a sheath of the knife sharpener of FIG. 1;

FIG. 4 is a top plan view of FIG. 3;

FIG. 5 is a front elevational view of FIG. 3;

FIG. 6 is a cross-sectional view through line 6-6 of FIG. 3;

FIG. 7 is a side elevational view of a handle of the knife sharpener of FIG 1;

FIG. 8 is a top plan view of FIG 7;

FIG. 9 is a cross-sectional view through line 9-9 of FIG. 7;

FIG. 10 is a front elevational view of FIG. 7;

FIG. 11 is a bottom plan view of FIG. 2;

FIG. 12 is a front end elevational view of FIG. 2; and,

FIG. 13 is a rear end elevational view of FIG. 2. 

The ornamental design for a knife sharpener, as shown and described. 